Malicious PDF — malware analysis report

Static analysis result for SHA-256 037ca38c7fafc36d…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 10:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdbac2d896a069188264fdfd51273722 SHA-1: 19a081274bebda1e03416ecff86b2a3c2d628f8d SHA-256: 037ca38c7fafc36da7c08934917826882eb9b42c8c92e28db1c6e91c2f77f613
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user to a harmful site. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=aura+by+carlos+fuentes+pdf+english
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/625844_e593a430c2f840afb961e583fbfe0a27.pdf
    • https://static.usrfiles.com/ugd/bf07b1_14afafeddc38449b8b3e86f8986391e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_de27bb6799ad459982c9868d9d06c784.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.pdf
    • https://static.usrfiles.com/ugd/5438e3_c195acad8eb34a649d47ea2b07d96cf4.pdf
    • https://static.usrfiles.com/ugd/cc15ef_a0064375a6a742e983a8dba4bc176234.pdf
    • https://static.usrfiles.com/ugd/ae059d_c2caa16af9d94104b079a19916abeabc.pdf
    • https://static.usrfiles.com/ugd/0f1814_698f49e24cff482abc71487971a814fe.pdf
    • https://static.usrfiles.com/ugd/40512e_455436f8345f4bef877d4025c99a4c02.pdf
    • https://static.usrfiles.com/ugd/8127dd_40465132df6846c18a004c89da20bc54.pdf
    • https://static.usrfiles.com/ugd/4826f5_4adf35b0d7de4b1fb5c54ddb34415ed4.pdf
    • https://static.usrfiles.com/ugd/90423f_a07cc27790df4b36a655631a9e84101f.pdf
    • https://static.usrfiles.com/ugd/73cb9e_c2ab8387203b408ca86f224c9b4fe402.pdf
    • https://static.usrfiles.com/ugd/d4579c_0336b4d707fa4008af6db216c15da0cd.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006116.bin
f705bf35ed8398445a9f7ae64312434b1095f82e3dd17fcb523443bff6e5dd38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 5528 bytes
font_01_sfnt_off000073d8.bin
974c89577421932930fba24d0bee06cfd07ede029765255f73f9f0e7471fb56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D8 9832 bytes
font_02_sfnt_off0000956a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x956A 4324 bytes

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